The wiki-weblog idea is still in its infancy (as is the blog.AboutUs.org implementation). Right now, we're using a WordPress format to make posts to the traditional weblog (for the RSS feed), while posts are often written and vetted on the main AboutUs wiki at Weblog/PotentialPosts. Over time, we plan to integrate the weblog with the main AboutUs.org website even more to allow for a richer set of community contributions.
If you have an idea for a weblog post, go ahead and add it to the Weblog/PotentialPosts page, or drop MarkDilley a note for more information on how to help. If you want, check out the Resources page for ideas.